Economics of bridgework, a sequel to Bridge engineering (1921)
Waddell, J. A. L. (John Alexander Low), 1854-1938 · New York, J. Wiley · leaf 339
ic Kiver. A vertical-lift bridge was estimated for each location, and the results compared. ECONOMICS OF MOVABLE SPANS 299 When contrasting the vertical hfts and the heel-trunnion bascules, itwas assumed that, for low vertical clearances, the lengths of moving spanswould be the same in the two… … 100 150 ZOO 250 0 50 100 150 200Leoffh o/bascule Span in fee/ ^ Sear fo{ Trunnion Verfica/ Move me of of [iff 5pan in Feef. Fig. 306. Percentage Weights for Double-Track-Railway, Vertical-Lift Bridges andSingle-Leaf, Heel-Trunnion Bascules. near the trunnion will generally intersect the bottom…
Bridges
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